Assuming it's a 190E, what year and model - and what is the problem? ECU and airflow meter can be checked for a large number of operational parameters, but this would be a waste if you have no clue which direction to look?
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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